This is a vintage 1954 stainless steel Rolex Oyster Perpetual Datejust 6305-2. There is an acrylic crystal, screw-down solid case back, and a Brevet screw-down winding crown. The 36mm diameter solid three-body case, integral downturned lugs, and fluted stainless steel bezel are polished/brushed. The original dial is white with applied faceted baton hour markers with dot hour indices, dauphine hands with luminous inserts, and a center sweep seconds hand. There is an outer minute/second track around the perimeter, and it has an alternating red and black "roulette" date wheel underneath a Cyclops magnification bubble in the crystal at the 3 o'clock position. It is an Officially Certified Chronometer. It's water resistant and the 14mm thick case, dial, crown, and movement are all signed.